Rotary compressor



Aug. 11, 1936. K. sTElNMANN ROTARY COMPRESSOR Filed July 22, 1935 Ffg. 5

lilly MoH/11.04,

Patented Aug. 11, 1936 UNITED- STATE ROTARY COMPRESSOR Karl Steinmann,Winterthur, Switzerland Application July 22, 1935, Serial No. 32,516

' In Great Britain October 16, 1934 y 9 Claims.

.I have led an application in Great Britain on the 16th October, 1934. l

'I'he present invention relates to a rotary piston compressor.

'I'he object of the invention is to provide an improved rotary pistoncompressor in which thev suction space is very eiliciently separatedfrom the delivery space of the engine by resilient packing means.Another object of the invention is to provide improved means foroperating and packing the movable abutment of the compressor.

Two constructions embodying .the features of the invention are shown byway of example in the accompanying drawing.

Figs. 1 and 2 show the first construction, Fig. 1 being a cross4section-throughA a, rotary piston compressor having a positivelycontrolled abutment slide, and Fig. 2 being a sectional elevationcorresponding to Fig. 1.

Fig. 3 shows in cross Ysection a second construction in which thesliding abutment plate is only controlled by springs.

Fig. 4 is a sectional-elevation corresponding to Fig. 3.

Referring to the drawing, I designates a stationary casing in which isrotatably mounted a piston 2. According to the invention, this piston isformed at the point of contact with the casing with a flattened portion4 and is also provided with a resilient packing cover 3 which is fixedlyconnected with the piston and therefore rotates with the piston.`Between the packing cover 3 and thejflattened portion 4 of the pistoni,a\ cavity orehollow space 5 is formed and this cavity communicates withthe working space by means of 'noles 6 arranged at the discharge side inthe resilient cover 3. The rotaryV piston 2 provided with the packingcover 3 is eccentrically mounted upon its shaft 1,' the shaft being, ofcourse, ar. ranged in the centre of the cylindrical casing. `By thiseccentric mounting of the rotary piston 2 upon its shaft 1 relatively`to the casing I, 'a Scythe-shaped working space 8 isv formed in thecasing, which is divided by a sliding abutment 9 into a suction spaceand a discharge space. The suction space communicates with a suction'conduit I5, this conduit being controlled by the rotary piston. 'Ihedelivery space communicates with a delivery conduit I6, a valve I8loaded by a spring I1 controlling the communication between the conduit'I6 and the delivery space.

In the construction according to Figs. 1 and 2, the sliding abutment 9is slidably and swingably mounted in the casing Ilby means of a rotarymember Il in which the abutment is adapted to (Cl. 23d-149) slide. Theabutment is positively operated by meansof two .connection rods I2, I2,the inner ends of which engage cams I3 mounted on both sides of therotary piston 2 upon the shaft 1. The abutment 9 is, moreover, providedwith an 5 additional packing strip I0 which is pressed by o ne or moresprings I I against the resilient cover 3 of the rotary piston. By thecooperation of the resilient packing cover 3 with the resilient packingstrip I0, a very satisfactory and resilient pack- 10 ing is obtainedbetween the suction and tle delivery spacesof the compressor.

In the construction according toFigs. 3 and 4, the sliding abutment 9slides radially in the casing I in a suitable long guideway; and thecasing is provided with one or more bores I9 in which are mountedsprings 20, the pressure of which may be adjusted by means of set screws2I. In this construction too a very satisfactory packingis obtainedbetween the abutment and the resilient cover.

I" claim:

1. In a rotary Apiston compressor the combination of: a stationarycasing; a rotary piston eccentrically mounted for rotation in thecasing, said piston being provided at `the point of contact with thecasing with a flattened portion and being also provided with a resilientcover, a cavity being formed between said flattened portion of thepiston and said resilient cover,- said resilient cover having an openingaffording communication between saidcavity and the delivery side of saidcasing; a sliding abutment cooperating with said rotary piston; anadmission conduit in said casing; and a discharge conduit in saidcasing.

' 2. In a rotary piston compressor the combination of; a stationarycasing; a rotarypiston eccentrically mounted for rotation in the casing,said piston being provided at the point of contact with the casing witha flattened portion-and being also provided with 'a resilient cover; acavity being formed between said flattened portion of the piston andsaid resilient cover, said resilient cover having an opening affordingcommunication between said cavity and the delivery side of said casing;a sliding abutment cooperating with said rotary piston; an admissionconduit in said casing; a discharge conduit in vsaid casin'g; and meansfor positively operating said sliding abutment.

3. In -a rotary piston compressor the combination of: 1a stationarycasing; a rotary piston eccentrically mounted for rotation in thecasing, said piston. being provided atthe point of contact with thecasing with a flattened portion and being also provided with a resilientcover; a cav- 55 ity being formed between said flattened portion of thepiston and said resilient cover, said resilient cover having an openingaffording communication between said cavity and the delivery side ofsaid casing; a sliding abutment cooper-ating with said rotary piston; anadmission conduit in said casing; and a discharge conduit in saidcasing; said sliding abutment being hollow and provided with a slidingpacking strip and with interiorly arranged springs pressing said packingstrip against said resilient cover.

4. In a rotary piston compressor kthe combination of a stationarycylindrical casing provided with inlet and outlet conduits; a centralshaft in said casing; a rotary piston eccentrically mounted upon saidshaft for rotation therewith, said rotary piston having at the point ofcontact with the periphery of the casing a flattened portion; aresilient cover fixed to said rotary piston and provided opposite theflattened portion of the piston with openings at the delivery side ofthe piston; a cavity being formed between said resillent cover and saidflattened portion of the piston; a member rotatably mounted in saidcasing between the inlet and the outlet conduits; a slidable abutmentslidably mounted in said rotary member; a packing strip slidably mountedin said abutment; springs within said abutment adapted to press saidpacking strip against said resilient cover; and means for positivelyoperating said sliding abutment by rotation of the shaft.

5. In a rotary piston compressor the combination of: a stationary casingprovided with an inlet and an outlet conduit; a central shaft rotatably,mounted in saidl casing; a rotary piston eccentrically mounted on saidshaft for rotation therewith, said rotary piston having a flattenedportion at the point of contact with said casing; a resilient cover xedto said piston, said resilient cover being provided with openings at thedelivery side of the piston through which a cavity formed between theflattened portion of the piston and said resilient cover communicateswith the working space of the piston; and a spring controlled slidableabutment plate between said inlet and outlet conduits.

6. A rotary piston compressor having a stationary casing and a rotarypiston therein, characterized by the fact that the rotary piston isprovided with a flattened portion and is also provided With a resilientpacking cover which is fixed to the piston and is provided towards thedelivery side with pressure relief openings, said rotary piston beingmounted eccentrically upon a shaft concentrically mounted in thestationary casing in such a manner that a Scythe-shaped working space isformed which is divided by a sliding abutment into a suction space and adelivery space,

- whereby the resilient packing cover, on the ocresilient packing orseparation of the suction and delivery spaces relatively to each otheris obtained.

7. In a rotary piston'compressor the combination with a stationarycasing, a rotary piston flattened at the portion nearest to the insidesurf ace of the casing, the piston being eccentrically mounted forrotation in the casing, the surface of the piston being surrounded by aclosed resilient cover, with a flexible part on the place where thepiston is flattened, the cover part and the flat- -.tened piston partforming a hollow space which is provided at the pressure side withpressure compensating bores for keeping the rotor tight against theinside surface of the casing.

8. In a-rotary piston compressor the combination with a stationarycasing, a rotary piston flattened at the portion nearest to the insidesurface ofI the casing, the piston being eccentrically mounted forrotation in the casing, the surface of the piston being surrounded by aclosed resilient cover with a flexible part on the place where thepiston is flattened, the cover part and flattened piston part forming ahollow space which is provided at the pressure side with pressurecompensating bores for keeping the rotor tight against the insidesurface of the casing, the eccentrically mounted piston forming acrescent-shaped working space in the casing, subdivided into asuctionspace and expelling-space, a member rotatably I mounted in saidcasing between the suction-space and expelling-space, a slidableabutment slidably mounted in said rotary member, a packing stripslidably mounted in said abutment, andy springs Within said abutment,adapted to press said packresilient cover with a flexible part on theplace where the piston is flattened, the cover part and flattened pistonpart forming a hollow space which is provided at the pressure side withpressure compensating bores for keeping the rotor tight against theinside surface of the casing, the eccentrically mounted piston forming acrescentshaped Working space, subdivided into a suctionf space andexpelling-space, a member rotatably mounted in said casing ,between thesuction-space and expelling-space, a slidable abutment slidably mountedin said rotary member, a packing strip slidably mounted in saidabutment, and springs Within said abutment, adapted to press saidpacking strip against said resilient cover, the slidable abutment beingcontrolled by two connecting rods, fixed to it and by two cams arrangedat the faces of the rotor, concentric with same.

KARL STEINMANN.

